I wish there was an "anti-report" feature, for those times you feel like someone doesn't deserve it
Last match is a prime example of when I'd use such a feature.
The Kha'Zix was an awesome teammate, but then got hit with (what appeared to be) a bugsplat into perpetual connection failure state. I've been there before myself, while rare it does happen. He was very obviously trying desperately to reconnect, as every other minute or so the game announced him reconnecting before disconnecting again.
I'm also confident he wasn't trolling. 7 kills with 0 deaths, consistently contributing to the team both in his lane and ours, taking towers, etc. His initial disconnect was seemingly random, happened while all three of us were taking the top lane inner tower. Also as mentioned before, he spent the rest of the match's duration attempting to reconnect.
He's going to get punished by Leaverbuster, but he definitely doesn't deserve it. I'm confident the Yasuo would agree with me on that.
As for what such an "anti-report" feature would do, it's quite simple.
After the match, you can click the red exclamation mark to bring up the option to "report" or "anti-report", at which point upon selecting "anti-report" you are given options for common reasons that you would wish to submit one. Stuff like "player doesn't deserve to be punished by Leaverbuster" and "player was being griefed/trolled by teammates".
The report is then submitted for manual review. If the review finds it true, then appropriate action is taken to fix any false punishment on the player's account (and compensation given, where applicable). If the review finds it false, then the anti-report is dismissed and nothing happens.